[PATCH linux dev-5.8 v3 06/12] watchdog: npcm: Add DT restart priority and reset type support

[Tomer Maimon <tmaimon77@gmail.com>]

Add Device tree restart priority and
three reset types support.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
---
 drivers/watchdog/npcm_wdt.c | 117 +++++++++++++++++++++++++++++++++++-
 1 file changed, 114 insertions(+), 3 deletions(-)

diff --git a/drivers/watchdog/npcm_wdt.c b/drivers/watchdog/npcm_wdt.c
index 765577f11c8d..a93180d0a6f4 100644
--- a/drivers/watchdog/npcm_wdt.c
+++ b/drivers/watchdog/npcm_wdt.c
@@ -11,7 +11,24 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/watchdog.h>
-
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+/* NPCM7xx GCR module */
+#define NPCM7XX_RESSR_OFFSET		0x6C
+#define NPCM7XX_INTCR2_OFFSET		0x60
+
+#define NPCM7XX_PORST			BIT(31)
+#define NPCM7XX_CORST			BIT(30)
+#define NPCM7XX_WD0RST			BIT(29)
+#define NPCM7XX_WD1RST			BIT(24)
+#define NPCM7XX_WD2RST			BIT(23)
+#define NPCM7XX_SWR1RST			BIT(28)
+#define NPCM7XX_SWR2RST			BIT(27)
+#define NPCM7XX_SWR3RST			BIT(26)
+#define NPCM7XX_SWR4RST			BIT(25)
+
+ /* WD register */
 #define NPCM_WTCR	0x1C
 
 #define NPCM_WTCLK	(BIT(10) | BIT(11))	/* Clock divider */
@@ -41,8 +58,11 @@
  */
 
 struct npcm_wdt {
-	struct watchdog_device  wdd;
+	struct watchdog_device	wdd;
 	void __iomem		*reg;
+	u32			card_reset;
+	u32			ext1_reset;
+	u32			ext2_reset;
 };
 
 static inline struct npcm_wdt *to_npcm_wdt(struct watchdog_device *wdd)
@@ -176,14 +196,65 @@ static const struct watchdog_ops npcm_wdt_ops = {
 	.restart = npcm_wdt_restart,
 };
 
+static void npcm_get_reset_status(struct npcm_wdt *wdt, struct device *dev)
+{
+	struct regmap *gcr_regmap;
+	u32 rstval;
+
+	gcr_regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
+	if (IS_ERR(gcr_regmap))
+		dev_warn(dev, "Failed to find gcr syscon, WD reset status not supported\n");
+
+	regmap_read(gcr_regmap, NPCM7XX_RESSR_OFFSET, &rstval);
+	if (!rstval) {
+		regmap_read(gcr_regmap, NPCM7XX_INTCR2_OFFSET, &rstval);
+		rstval = ~rstval;
+	}
+
+	if (rstval & wdt->card_reset)
+		wdt->wdd.bootstatus |= WDIOF_CARDRESET;
+	if (rstval & wdt->ext1_reset)
+		wdt->wdd.bootstatus |= WDIOF_EXTERN1;
+	if (rstval & wdt->ext2_reset)
+		wdt->wdd.bootstatus |= WDIOF_EXTERN2;
+}
+
+static u32 npcm_wdt_reset_type(const char *reset_type)
+{
+	if (!strcmp(reset_type, "porst"))
+		return NPCM7XX_PORST;
+	else if (!strcmp(reset_type, "corst"))
+		return NPCM7XX_CORST;
+	else if (!strcmp(reset_type, "wd0"))
+		return NPCM7XX_WD0RST;
+	else if (!strcmp(reset_type, "wd1"))
+		return NPCM7XX_WD1RST;
+	else if (!strcmp(reset_type, "wd2"))
+		return NPCM7XX_WD2RST;
+	else if (!strcmp(reset_type, "sw1"))
+		return NPCM7XX_SWR1RST;
+	else if (!strcmp(reset_type, "sw2"))
+		return NPCM7XX_SWR2RST;
+	else if (!strcmp(reset_type, "sw3"))
+		return NPCM7XX_SWR3RST;
+	else if (!strcmp(reset_type, "sw4"))
+		return NPCM7XX_SWR4RST;
+
+	return 0;
+}
+
 static int npcm_wdt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	const char *card_reset_type;
+	const char *ext1_reset_type;
+	const char *ext2_reset_type;
 	struct npcm_wdt *wdt;
+	u32 priority;
 	int irq;
 	int ret;
 
-	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
+	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
 	if (!wdt)
 		return -ENOMEM;
 
@@ -195,6 +266,45 @@ static int npcm_wdt_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return irq;
 
+	if (of_property_read_u32(pdev->dev.of_node, "nuvoton,restart-priority",
+				 &priority))
+		watchdog_set_restart_priority(&wdt->wdd, 128);
+	else
+		watchdog_set_restart_priority(&wdt->wdd, priority);
+
+	ret = of_property_read_string(pdev->dev.of_node,
+				      "nuvoton,card-reset-type",
+				      &card_reset_type);
+	if (ret) {
+		wdt->card_reset = NPCM7XX_PORST;
+	} else {
+		wdt->card_reset = npcm_wdt_reset_type(card_reset_type);
+		if (!wdt->card_reset)
+			wdt->card_reset = NPCM7XX_PORST;
+	}
+
+	ret = of_property_read_string(pdev->dev.of_node,
+				      "nuvoton,ext1-reset-type",
+				      &ext1_reset_type);
+	if (ret) {
+		wdt->ext1_reset = NPCM7XX_WD0RST;
+	} else {
+		wdt->ext1_reset = npcm_wdt_reset_type(ext1_reset_type);
+		if (!wdt->ext1_reset)
+			wdt->ext1_reset = NPCM7XX_WD0RST;
+	}
+
+	ret = of_property_read_string(pdev->dev.of_node,
+				      "nuvoton,ext2-reset-type",
+				      &ext2_reset_type);
+	if (ret) {
+		wdt->ext2_reset = NPCM7XX_SWR1RST;
+	} else {
+		wdt->ext2_reset = npcm_wdt_reset_type(ext2_reset_type);
+		if (!wdt->ext2_reset)
+			wdt->ext2_reset = NPCM7XX_SWR1RST;
+	}
+
 	wdt->wdd.info = &npcm_wdt_info;
 	wdt->wdd.ops = &npcm_wdt_ops;
 	wdt->wdd.min_timeout = 1;
@@ -213,6 +323,7 @@ static int npcm_wdt_probe(struct platform_device *pdev)
 		set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);
 	}
 
+	npcm_get_reset_status(wdt, dev);
 	ret = devm_request_irq(dev, irq, npcm_wdt_interrupt, 0, "watchdog",
 			       wdt);
 	if (ret)
-- 
2.22.0